It's by design. Sharing solution is not something that one normally wants to, or should, do. The design is to share the list of geocaches, and the usernote fields that exists in the table.
You could use the usernote fields to share the solutions, but it is a bit of work. First you will have to copy the solutions into one of the user fields, then the other person needs to copy them from there into their cache notes.
We have been considering an automatic solution, but it's not anything that will happen soon, with two main reasons.
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Sharing cache solutions is generally not the right thing to do, and we are afraid that the side-effect will be that we will support something that we don't want to. But there are of course cases where it is correct.
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Automatically writing to users personal cache notes or corrected coordinates could potentially remove data that they already have.